| Title | Energy-Level Modulation in Diboron-Modified SnO2 for High-Efficiency Perovskite Solar Cells |
| Authors | Li, Nengxu Niu, Xiuxiu Pei, Fengtao Liu, Huifen Cao, Yang Liu, Yuquan Xie, Haipeng Gao, Yongli Chen, Qi Mo, Fanyang Zhou, Huanping |
| Affiliation | Peking Univ, Coll Engn, Beijing Key Lab Theory & Technol Adv Battery Mat, Beijing 100871, Peoples R China Peking Univ, Coll Engn, Key Lab Polymer Chem & Phys, Minist Educ, Beijing 100871, Peoples R China Beijing Inst Technol, Dept Mat Sci & Engn, Beijing 100081, Peoples R China Peking Univ, Coll Engn, Dept Energy & Resources Engn, Beijing 100871, Peoples R China Cent S Univ, Coll Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, Changsha 410012, Hunan, Peoples R China |
| Keywords | LIGHT-EMITTING-DIODES CONVERSION LAYERS PHOTODETECTORS EMERGENCE IODIDE |
| Issue Date | Feb-2020 |
| Publisher | SOLAR RRL |
| Abstract | Energy-level modulation between perovskite and carrier transport layers to obtain a promoted carrier extraction and reduced charge recombination is an effective way to achieve high-efficiency perovskite solar cells. Here, diboron is used as an effective interfacial modifier between SnO2 and perovskite. By taking advantage of the higher Fermi level on the surface of SnO2 after diboron treatment, a power-conversion efficiency of 22.04% in a solar cell device based on two-step solution-processed planar n-i-p structure is obtained. With the help of thorough characterizations, it is argued that the diboron-treated SnO2 exhibits some Sn3+ species, which serve as electron donors with a more n-type nature, promoting electron extraction and reducing carrier recombination in the electron transport layer (ETL)/perovskite interface. Further analysis speculates that the formation of surface diboron-oxygen Lewis pair induces a reducing state of diboron complexes, resulting in the spontaneous electron redistribution and the formation of Sn3+-O-center dot species. This provides an effective chemical approach to tune the energy alignment between the oxide ETL and absorber. |
| URI | http://hdl.handle.net/20.500.11897/584592 |
| ISSN | 2367-198X |
| DOI | 10.1002/solr.201900217 |
| Indexed | SCI(E) Scopus EI |
| Appears in Collections: | 工学院 先进电池材料料理论与技术北京市重点实验室 高分子化学与物理教育部重点实验室 |
